Universitatea Craiova Mihăilă made his senior debut for
Universitatea Craiova on 24 October 2017, aged 17, in a 2–0 away victory over
Sepsi OSK counting for the
Cupa României. He did not appear in any other match during
that season, but on 9 August 2018 started in a 3–1 away defeat to
RB Leipzig in the
UEFA Europa League third qualifying round. His
Liga I debut also came against Sepsi OSK, in a 0–1 loss on 29 July 2018. Mihăilă began to play frequently, and on 19 April 2019 recorded his first league goal—and the only of the match—in an away fixture with
Astra Giurgiu, one of his former youth clubs. He amassed 32 matches across all competitions in the
2018–19 campaign, and in December 2019 manager
Victor Pițurcă confirmed that Craiova rejected a €5 million bid for him from fellow league team
FCSB. During
his third season in
Oltenia, Mihăilă totalled nine goals and came close to claiming the national championship; his side however lost the final fixture 1–3 to eventual champions
CFR Cluj on 3 August 2020.
Parma On 5 October 2020, Italian team
Parma announced the signing of Mihăilă on a five-year contract, with the transfer fee being reportedly worth €8.5 million. The sum represented the third-
most expensive sale of the Romanian championship at the time, slightly surpassing his former Craiova teammate
Alexandru Mitriță on that place. After recovering from
athletic pubalgia, Mihăilă made his debut on 3 January 2021 by coming on as a
substitute in a 0–3
Serie A loss to
Torino. Mihăilă was a starter for the first time on 21 January 2021, scoring the
equaliser in an eventual 1–2 defeat to
Lazio in
Coppa Italia's
round of 16. He registered his first league goal on 7 March, in a 3–3 away draw with
Fiorentina in which he also assisted
Jasmin Kurtić. The following fixture, his compatriot
Dennis Man assisted him to open the scoring in a 2–0 defeat of
Roma. Mihăilă ended the league season with three goals from 16 appearances, as the club got relegated to the
Serie B. On 31 January 2022, Mihăilă joined Serie A club
Atalanta on a five-month loan with an option to buy. He did not impress during his stint in
Bergamo, featuring in only seven matches without scoring. After returning to Parma, Mihăilă converted a
free kick in the Serie B
opener, a 2–2 draw with
Bari on 12 August 2022. Mihăilă struggled with recurring injuries before regaining his fitness in the
2023–24 season, aiding with 6 goals from 35 appearances in all competitions as Parma won
its first-ever Serie B title and reached the top division after a three-year pause. The
following campaign, he played 21 Serie A matches before suffering another injury at the start of 2025.
Çaykur Rizespor On 18 July 2025, Mihăilă agreed a four-year contract with Turkish side
Çaykur Rizespor. The €2 million transfer fee reportedly equalled the club record for the most expensive signing, held by
Léonard Kweuke since 2013. Mihăilă made his debut on 10 August, playing 59 minutes in a 0–3
Süper Lig loss to
Göztepe. ==International career==